https://www.engineersedge.com/engineering-forum/
enThu, 24 May 2018 19:50:20 GMTvBulletin30https://www.engineersedge.com/engineering-forum/images/misc/rss.pnghttps://www.engineersedge.com/engineering-forum/
https://www.engineersedge.com/engineering-forum/showthread.php/5289-GD-T-callout-for-sharp-edge?goto=newpost
Wed, 09 May 2018 13:46:07 GMTHi folks,
I am working on a cylindrical ceramic part that has a hole in it. The sharpness of both the inner edge of the hole and the outer edge of...

Hi folks,

I am working on a cylindrical ceramic part that has a hole in it. The sharpness of both the inner edge of the hole and the outer edge of the ceramic part are critical to the function of this part, and they are not guaranteed - the nature of the ceramic material means that these edges are quite likely to develop chips during initial machining. I'd like some way to mandate that these edges deviate from an ideal circular profile by no more than X. Here's what I've thought of so far:

Define a very tight flatness tolerance for the end of the part (the face the contains both the inner and outer edges)

Specify a surface finish tolerance on the end of the part, as well as on the inner and outer diameters. This idea was suggested by someone else (credit where credit is due).

Apply a line profile control to the inner and outer edges. Intuitively, this feels like the way I'd want to do this - basically, define a swept cylinder along the ideal edge with radius X which the edge cannot deviate from. However, my reading indicates this isn't a valid use of this control.

We use ASME Y14.5-2009. Any thoughts about which of these is best - or alternative suggestions - are very welcome. Thanks very much!

]]>julian_bellhttps://www.engineersedge.com/engineering-forum/showthread.php/5289-GD-T-callout-for-sharp-edgePlease help answer this questionhttps://www.engineersedge.com/engineering-forum/showthread.php/5277-Please-help-answer-this-question?goto=newpost
Mon, 30 Apr 2018 23:57:30 GMTCan someone please help answer the following questions?
*C3. *Using the fixed fastener formula calculate the true position tolerance for the two...

Can someone please help answer the following questions?

C3. Using the fixed fastener formula calculate the true position tolerance for the two patterns shown below. (Show your work).

C3.1. The size of the bolts are (diameter) 0.492 – 0.500 and the size of the clearance holes are (diameter) 0.520 – 0.536.
[IMG]file:///C:/Users/PETERB~1/AppData/Local/Temp/msohtmlclip1/01/clip_image002.png[/IMG]
C3.2 The size of the bolts are (diameter) 0.245 – 0.250 and the size of the clearance holes are (diameter) 0.2656 – 0.270.

C3.3 Use the floating fastener formula and calculate the true position tolerance for the above 4 hole pattern, given the size of the bolts are (diameter) 0.492 – 0.500 and the size of the clearance holes are (diameter) 0.520 – 0.536.
[IMG]file:///C:/Users/PETERB~1/AppData/Local/Temp/msohtmlclip1/01/clip_image004.png[/IMG]
C3.4 Using the floating fastener formula calculate the plus/minus tolerance for the holes shown above if the bolts are 0.370 – 0.375 and the clearance holes are 0.386 – 0.397.